diff --git a/numpy/distutils/command/build_clib.py b/numpy/distutils/command/build_clib.py
index a4f49b00eaa2..e1f15d465e7b 100644
--- a/numpy/distutils/command/build_clib.py
+++ b/numpy/distutils/command/build_clib.py
@@ -132,12 +132,12 @@ def run(self):
                 log.info("Detected changes on compiler optimizations, force rebuilding")
                 self.force = True
 
-            import atexit
-            def report():
+            def report(copt):
                 log.info("\n########### CLIB COMPILER OPTIMIZATION ###########")
-                log.info(self.compiler_opt.report(full=True))
+                log.info(copt.report(full=True))
 
-            atexit.register(report)
+            import atexit
+            atexit.register(report, self.compiler_opt)
 
         if self.have_f_sources():
             from numpy.distutils.fcompiler import new_fcompiler
diff --git a/numpy/distutils/command/build_ext.py b/numpy/distutils/command/build_ext.py
index 91cb0d897021..ca29ad4c0c19 100644
--- a/numpy/distutils/command/build_ext.py
+++ b/numpy/distutils/command/build_ext.py
@@ -160,11 +160,12 @@ def run(self):
                 log.info("Detected changes on compiler optimizations, force rebuilding")
                 self.force = True
 
-            import atexit
-            def report():
+            def report(copt):
                 log.info("\n########### EXT COMPILER OPTIMIZATION ###########")
-                log.info(self.compiler_opt.report(full=True))
-            atexit.register(report)
+                log.info(copt.report(full=True))
+
+            import atexit
+            atexit.register(report, self.compiler_opt)
 
         # Setup directory for storing generated extra DLL files on Windows
         self.extra_dll_dir = os.path.join(self.build_temp, '.libs')